Our SharePoint installation is using a custom masterpage at the moment and I would like to create a completely new one.
All of the sites are using custom.master, located in the master page gallery /_catalogs/masterpage/Forms/AllItems.aspx. If I change the top level site back to default.master and select to update all subsites, only some of the sites change while others remain on the custom.master style (despite being directed to inherit from parent or told specifically to use default.master).
I have tried modifying the custom.master file in SharePoint Designer and I have made a small change (adding a hyphen into a link in the footer). This updates fine for the sites that will revert to default.master but not those that won’t update at all. It would appear that they are using a different custom.master file but I am not sure where to find this or how they are being told to use it.
I would appreciate any suggestions to help point me in the right direction. Many thanks in advance.